Wildshape at lv 1 - balance

I'll be running a one-shot trial session of 5e with my family shortly. None of them have played RPGs before, and only one of them has played video games, so to help them decide what they might find fun to play, I gave them this flowchart to give them an idea of what each class does: https://www.lucidchart.com/pages/flowcharts/which-dungeons-and-dragons-class-should-you-play

Mum has decided she wants to be a druid - specifically a druid that gets in enemies' faces and turns into a bear. Problem: druids get wildshape at level 2, and I want to run this one-shot at level 1. So she won't be able to play anything close to the character she's picked out.

How bad would allowing wildshape in a level 1 party be? At the moment I'm thinking of restricting it to CR1/8, or going CR1/4 but restricting it to one use/short rest.